📄 des.java
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/*
* Created on 2004-10-30
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/**
* @author 李益民 我的第一个java程序
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class Des {
/**
*
*/
int subkey[][]=new int[16][48];//子密钥
///轮函数使用
int E[]={32,1,2,3,4,5,
4,5,6,7,8,9,
8,9,10,11,12,13,
12,13,14,15,16,17,
16,17,18,19,20,21,
20,21,22,23,24,25,
24,25,26,27,28,29,
28,29,30,31,32,1};
int P[]={16,7,20,21,
29,12,28,17,
1,15,23,26,
5,18,31,10,
2,8,24,14,
32,27,3,9,
19,13,30,6,
22,11,4,25};
int IP[]={58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6,
64,56,48,40,32,24,16,8,
57,49,41,33,25,17,9,1,
59,51,43,35,27,19,11,3,
61,53,45,37,29,21,13,5,
63,55,47,39,31,23,15,7};
int IP_1[]={40,8,48,16,56,24,64,32,
39,7,47,15,55,23,63,31,
38,6,46,14,54,22,62,30,
37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,
35,3,43,11,51,19,59,27,
34,2,42,10,50,18,58,26,
33,1,41,9,49,17,57,25};
int S[][][]={
{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
{0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
{4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
{15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}}, //s1
{{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
{3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
{0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},
{13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}}, //s2
{{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
{13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
{13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
{1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}}, //s3
{{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
{13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
{10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
{3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}}, //s4
{{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
{14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
{4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
{11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}}, //s5
{{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
{10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
{9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
{4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}}, //s6
{{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
{13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
{1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
{6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}}, //s7
{{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
{1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}}}; //s8
int result[]=new int[64];
public Des()
{
super();
// TODO Auto-generated constructor stub
}
public void LS(int aray[],int num,int shiftbit) //循环左移
{
for(int j=0;j<shiftbit;j++)
{
int temp=aray[0];
for(int i=0;i<num-1;i++)
aray[i]=aray[i+1];
aray[num-1]=temp;
}
}
public int GenSubKey(int key[]) //产生16个子密钥
{
// 子密钥产生使用
int ip[]={58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6,
64,56,48,40,32,24,16,8,
57,49,41,33,25,17,9,1,
59,51,43,35,27,19,11,3,
61,53,45,37,29,21,13,5,
63,55,47,39,31,23,15,7};
int PC_1[]={57,49,41,33,25,17,9,
1,58,50,42,34,26,18,
10,2,59,51,43,35,27,
19,11,3,60,52,44,36,
63,55,47,39,31,23,15,
7,62,54,46,38,30,22,
14,6,61,53,45,37,29,
21,13,5,28,20,12,4};
int PC_2[]={14,17,11,24,1,5,
3,28,15,6,21,10,
23,19,12,4,26,8,
16,7,27,20,13,2,
41,52,31,37,47,55,
30,40,51,45,33,48,
44,49,39,56,34,53,
46,42,50,36,29,32};
int shiftbit[]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; //每轮需要左移的次数
int C[]=new int [28];
int D[]=new int [28];
for(int i=0;i<28;i++)
C[i]=key[PC_1[i]-1];
for(int j=0;j<28;j++)
D[j]=key[PC_1[j+28]-1];
for(int r=0;r<16;r++)
{
LS(C,28,shiftbit[r]);
LS(D,28,shiftbit[r]);
for(int k=0;k<48;k++)
{
int index=PC_2[k]-1;
if(index<28)
subkey[r][k]=C[index];
else
subkey[r][k]=D[index-28];
}
}
return(1);
}
public void SetKey(int key[])
{
GenSubKey(key);
}
public void XorAray(int aray1[],int aray2[],int arayout[],int length)///数组模2加
{
for(int k=0;k<length;k++)
{
arayout[k]=(aray1[k]+aray2[k])%2;
}
}
public void Fun_f(int data_in[],int data_out[],int r) ///f(r,k)函数
{
int data48[]=new int[48];
int datatemp[]=new int[48];
for(int i=0;i<48;i++) //E膨胀
{
data48[i]=data_in[E[i]-1];
}
XorAray(data48,subkey[r],data48,48);
int row,col;
//////////////////////////////////////////////////
for(int si=0;si<8;si++)
{
row=data48[si*6]*2+data48[si*6+5];
col=data48[si*6+1]*8+data48[si*6+2]*4+data48[si*6+3]*2+data48[si*6+4];
int sdata=S[si][row][col];
for(int k=3;k>=0;k--)
{
datatemp[si*4+k]=sdata&0x1;
sdata>>=1;
}
for(int j=0;j<32;j++) //P置换
data_out[j]=datatemp[P[j]-1];
}
}
public void encrypt(int plain[]) ///密文放在result[]中
{
int L[]=new int[32];
int R[]=new int[32];
int out[]=new int[32];
for(int i=0;i<32;i++)
{
L[i]=plain[IP[i]-1];
}
for(int i=0;i<32;i++)
{
R[i]=plain[IP[i+32]-1];
}
System.out.println("encrypt:");
for(int r=0;r<16;r++)
{
Fun_f(R,out,r);
XorAray(L,out,out,32);
for(int j=0;j<32;j++)
L[j]=R[j];
for(int j=0;j<32;j++)
R[j]=out[j];
//////////////////////
System.out.println("");
System.out.println("L"+r);
for(int i=0;i<32;i++)
{
if(i%8==0) System.out.print(" ");
System.out.print(L[i]);
///
}
System.out.print("\n");
System.out.println("R"+r);
for(int i=0;i<32;i++)
{
if(i%8==0) System.out.print(" ");
System.out.print(""+R[i]);
//
}
}
for(int i=0;i<64;i++)
{
int index=IP_1[i]-1;
if(index<32)
result[i]=R[index];
else
result[i]=L[index-32];
}
}
public void decrypt(int descode[]) ///明文放在result[]中
{
int L[]=new int[32];
int R[]=new int[32];
int out[]=new int[32];
for(int i=0;i<32;i++)
{
L[i]=descode[IP[i]-1]; //先通过IP盒
}
for(int i=0;i<32;i++)
{
R[i]=descode[IP[i+32]-1];
}
System.out.println("decrypt:");
for(int r=0;r<16;r++)
{
Fun_f(R,out,15-r); ///子密钥使用与加密相反的顺序
XorAray(L,out,out,32);
for(int j=0;j<32;j++)
L[j]=R[j];
for(int j=0;j<32;j++)
R[j]=out[j];
//////////////////////
System.out.println("");
System.out.println("L"+r);
for(int i=0;i<32;i++)
{
if(i%8==0) System.out.print(" ");
System.out.print(L[i]);
///
}
System.out.print("\n");
System.out.println("R"+r);
for(int i=0;i<32;i++)
{
if(i%8==0) System.out.print(" ");
System.out.print(""+R[i]);
//
}
}
for(int i=0;i<64;i++)
{
int index=IP_1[i]-1;
if(index<32)
result[i]=R[index];
else
result[i]=L[index-32];
}
}
public static void main(String[] args)
{
int key[]={0,1,1,1,0,0,0,0,
0,0,1,1,1,0,0,0,
1,0,0,1,1,0,1,0,
1,1,1,0,1,1,0,0,
0,1,1,1,0,1,1,0,
1,0,0,1,0,0,1,0,
1,0,0,0,0,1,0,0,
1,1,0,1,1,0,1,0};
int min[]={0,1,1,0,0,0,1,1,
0,1,1,0,1,1,1,1,
0,1,1,0,1,1,0,1,
0,1,1,1,0,0,0,0,
0,1,1,1,0,1,0,1,
0,1,1,1,0,1,0,0,
0,1,1,0,0,1,0,1,
0,1,1,1,0,0,1,0};
Des d=new Des();
d.GenSubKey(key);
d.encrypt(min);
System.out.println("");
System.out.println("encrypt result");
for(int i=0;i<64;i++)
{
if(i%8==0) System.out.print(" ");
System.out.print(d.result[i]);
}
System.out.println("");
d.decrypt(d.result);
System.out.println("");
System.out.println("decrypt result");
for(int i=0;i<64;i++)
{
if(i%8==0) System.out.print(" ");
System.out.print(d.result[i]);
}
System.out.println("");
System.out.println("第一次用java写程序，感觉最不爽的是java没有指针，对在c++中用惯了指针的我来说感到有点笨拙，\n不过没有指针确实不容易出错，程序调试工作量很小.\n\n 李益民 20041030");
}
}
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